Henry Horatio O'Brien, Lord O'Brien (died 1690) (1670–1690) Parents Henry O'Brien, 7th Earl of Thomond Sarah Russell Children Mary O'Brien Henry O'Brien, 8th Earl of Thomond Siblings Lady Auberie Anne Penelope O'Brien Lady Elizabeth O'Brien Henry O'Brien, Lord Ibrackan Lady Mary O'Brien Partners Henrietta Howard, Countess of Suffolk